reacting an olefin-based compound with a synthetic gas in a hydroformylation reactor in the presence of a catalyst to produce a reaction product comprising an aldehyde;

introducing the reaction product to a vaporizer comprising a vaporizer catch pot;

separating low-boiling point components of the reaction product from an upper part of the vaporizer catch pot;

separating high-boiling point components of the reaction product from a lower part of the vaporizer catch pot; and

recirculating at least a portion of the low-boiling point components separated from the upper part of the vaporizer catch pot back to the vaporizer catch pot,

wherein a weight of the low-boiling point components recirculated to the vaporizer catch pot is from 0.1 times to 10 times a weight of the high-boiling point components separated from the lower part of the vaporizer catch pot.